| 摘要 |
The invention relates to a shaft centre part for an attachable and/or lockable connection which can be sealed to a shaft lower part and/or a shaft upper part and/or other shaft centre parts. The shaft centre part comprises a connecting element which is arranged on at least one of the free ends thereof and also reinforcing elements. The aim of the invention is to overcome the disadvantages of known prior art and to display a shaft centre part which can be produced in an efficient and economical manner, which has high annular rigidity, which is light and can be lifted in a safe manner, can be transported and/or constructed and the surrounding can be filled in and/or compacted in a satisfactory and/or correct manner. Said aim is achieved by virtue of the fact that the reinforcing elements are arranged in an approximately parallel manner in relation to the direction of the periphery, whereby the axial distance between one pair of reinforcing elements is approximately the difference from the external radius of the reinforcing elements and the shaft wall of the shaft centre part and the axial distance between one first pair of reinforcing elements in relation to a second pair of reinforcing elements is at least double the difference from the external radius of the reinforcing elements and the shaft wall of the shaft centre part. |
